So Denki Kaminari has a normal life, normal friends and at the third year of his local UA school. Everyone knows him as the electric hero who everyone knows and loves. But then there is Guest who is a masked hero who saves people and people make myths about the secret hero, Guest is technically the masked secret hero who comes when the police or heroes come to late to late to save the day.

One midnight, Denki was sleepy and walking home after a tiring day from UA then there was a villain who tried to sneak up on Denki and attack him from behind until Guest captured the villain before the villain could do anything and Guest disappeared into the distance and Denki witnessed the whole thing and became in love with the secret masked hero and of course that the next morning, he would definitely tell everyone at his school.